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Fair Value Disclosures (Measured on a Non-Recurring Basis) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total gains (losses) on impaired loans $ 10,747 $ 15,147  
Total gains (losses) on foreclosed properties 1,484 $ 1,069  
Impaired loans      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets measured on a non-recurring basis, fair value 10,747   $ 15,147
Impaired loans | Fair Value Measurements - Level 1 Inputs      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets measured on a non-recurring basis, fair value 0   0
Impaired loans | Fair Value Measurements - Level 2 Inputs      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets measured on a non-recurring basis, fair value 4,333   10,063
Impaired loans | Fair Value Measurements - Level 3 Inputs      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets measured on a non-recurring basis, fair value 6,414   5,084
Foreclosed properties | Fair Value Measurements - Level 1 Inputs      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets measured on a non-recurring basis, fair value 0   0
Foreclosed properties | Fair Value Measurements - Level 2 Inputs      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets measured on a non-recurring basis, fair value 1,484   1,069
Foreclosed properties | Fair Value Measurements - Level 3 Inputs      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets measured on a non-recurring basis, fair value $ 0   $ 0